env_volumetric_fog_volume
- Half-Life: Alyx
- Dota 2
- Steam VR

Point Entity
Sets a user bounding volume for volumetric fog - if one of these are in the map then all fog will get clamped to it. More than one then fog gets rendered if it's inside any of them.
Keyvalues
-
Start Disabled (
StartDisabled
) <Boolean
> -
Parent (
parentname
) <TargetDestination
>
The name of this entity's parent in the movement hierarchy. Entities with parents move with their parent. -
Parent Model Bone/Attachment Name (
parentAttachmentName
) <ParentAttachment
>
The name of the bone or attachment to attach to on the entity's parent in the movement hierarchy. Use !bonemerge to use bone-merge style attachment. -
Model Attachment position offset (
local.origin
) <Vector
>
Offset in the local space of the parent model's attachment/bone to use in hierarchy. Not used if you are not using parent attachment. -
Model Attachment angular offset (
local.angles
) <Angle
>
Angular offset in the local space of the parent model's attachment/bone to use in hierarchy. Not used if you are not using parent attachment. -
Model Attachment scale (
local.scales
) <Vector
>
Scale in the local space of the parent model's attachment/bone to use in hierarchy. Not used if you are not using parent attachment. -
Use Model Attachment Offset (
useLocalOffset
) <Boolean
>
Whether to respect the specified local offset when doing the initial hierarchical attachment to its parent. -
Entity Scripts (
vscripts
) <ScriptList
>
Name(s) of script files that are executed after all entities have spawned. -
Name (
targetname
) <TargetSource
>
The name that other entities refer to this entity by. -
Box Mins (
box_mins
) <Vector
> -
Box Maxs (
box_maxs
) <Vector
> -
Fog strength (
FogStrength
) <Float
>
Technically the scattering value. Higher values make denser fog. -
Falloff Exponent (
FalloffExponent
) <Float
>
Controls the fall off curve for the fog at the edges -
Falloff Shape (
Shape
) <Choices
>- Linear (Box) Falloff
- Radial (Sphere) Falloff
Inputs
-
Enable <
Void
>
Enable this entity. -
Disable <
Void
>
Disable this entity. -
SetParent <
TargetDestination
>
Changes the entity's parent in the movement hierarchy. -
SetParentAttachment <
String
>
Change this entity to attach to a specific attachment point on its parent. Entities must be parented before being sent this input. The parameter passed in should be the name of the attachment. -
SetParentAttachmentMaintainOffset <
String
>
Change this entity to attach to a specific attachment point on it's parent. Entities must be parented before being sent this input. The parameter passed in should be the name of the attachment. The entity will maintain it's position relative to the parent at the time it is attached. -
ClearParent <
Void
>
Removes this entity from the the movement hierarchy, leaving it free to move independently. -
RunScriptFile <
String
>
Load and execute a script file -
RunScriptCode <
String
>
Execute a fragment of script code -
CallScriptFunction <
String
>
Call a script function -
CallPrivateScriptFunction <
String
>
Calls a script function from this entity's private script scope. -
CallGlobalScriptFunction <
String
>
Calls a script function in the global script scope. -
Kill <
Void
>
Removes this entity from the world. -
KillHierarchy <
Void
>
Removes this entity and all its children from the world. -
AddOutput <
String
>
Adds an entity I/O connection to this entity. Parameter format: outputname>targetname>inputname>parameter>delay>max times to fire (-1 == infinite). Very dangerous, use with care. -
FireUser1 <
Void
>
Causes this entity's OnUser1 output to be fired. -
FireUser2 <
Void
>
Causes this entity's OnUser2 output to be fired. -
FireUser3 <
Void
>
Causes this entity's OnUser3 output to be fired. -
FireUser4 <
Void
>
Causes this entity's OnUser4 output to be fired.
Outputs
-
OnUser1 <
Void
>
Fired in response to FireUser1 input. -
OnUser2 <
Void
>
Fired in response to FireUser2 input. -
OnUser3 <
Void
>
Fired in response to FireUser3 input. -
OnUser4 <
Void
>
Fired in response to FireUser4 input. -
OnKilled <
Void
>
Fired when the entity is killed and removed from the game.

Point Entity
Sets a user bounding volume for volumetric fog - if one of these are in the map then all fog will get clamped to it. More than one then fog gets rendered if it's inside any of them.
Keyvalues
-
Start Disabled (
StartDisabled
) <Boolean
> -
Parent (
parentname
) <TargetDestination
>
The name of this entity's parent in the movement hierarchy. Entities with parents move with their parent. -
Parent Bone/Attachment Name (
parentAttachmentName
) <ParentAttachment
>
The name of the bone or attachment to attach to on the entity's parent in the movement hierarchy. Use !bonemerge to use bone-merge style attachment. NOTE: If this is specified the Hammer transform will be disregarded, even if 'Use Local Transform' is NOT specified (in that case local transform will be identity) -
Use Local Transform (
useLocalOffset
) <Boolean
>
Whether to respect the specified local offset when doing the initial hierarchical attachment to its parent. -
Local Origin (
local.origin
) <Vector
>
Offset in the local space of the parent model's attachment/bone to use in hierarchy. Not used if you are not using parent attachment. -
Local Angles (
local.angles
) <Angle
>
Angular offset in the local space of the parent model's attachment/bone to use in hierarchy. Not used if you are not using parent attachment. -
Local Scale (
local.scales
) <Vector
>
Scale in the local space of the parent model's attachment/bone to use in hierarchy. Not used if you are not using parent attachment. -
Entity Scripts (
vscripts
) <ScriptList
>
Name(s) of script files that are executed after all entities have spawned. -
Name (
targetname
) <TargetSource
>
The name that other entities refer to this entity by. -
Box Mins (
box_mins
) <Vector
> -
Box Maxs (
box_maxs
) <Vector
> -
Fog strength (
FogStrength
) <Float
>
Technically the scattering value. Higher values make denser fog. -
Falloff Exponent (
FalloffExponent
) <Float
>
Controls the fall off curve for the fog at the edges -
Falloff Shape (
Shape
) <Choices
>- Linear (Box) Falloff
- Radial (Sphere) Falloff
- Height (Box) Falloff
-
Override Tint Color (
OverrideTintColor
) <Boolean
>
Override the global tint color in this fog volume. -
Tint Color (
TintColor
) <Color255
>
Tint color for fog. -
Height Fog Vertical Depth (
HeightFogDepth
) <Float
>
Vertical depth before height fog is maximum intensity -
Height Fog Edge Width (
HeightFogEdgeWidth
) <Float
>
Horizonal fade width of height fog -
Indirect lighting uses LPVs (
IndirectUseLPVs
) <Boolean
>
Use LPVs for indirect lighting: higher resolution, but will not honor fog lighting enable/disable on lights -
Override Fog Indirect Lighting Strength (
OverrideFogIndirectStrength
) <Boolean
> -
Fog Indirect Lighting Strength (
FogIndirectStrength
) <Float
>
Volume-local scalar for indirect lighting strength -
Override Fog Sun Light Strength (
OverrideFogSunLightStrength
) <Boolean
> -
Fog Sun Light Strength (
FogSunLightStrength
) <Float
>
Volume-local scalar for sun (light_environment) light strength -
Override Fog Noise Strength (
OverrideFogNoiseStrength
) <Boolean
> -
Fog Noise Strength (
FogNoiseStrength
) <Float
>
Volume-local fog noise strength
Inputs
-
Enable <
Void
>
Enable this entity. -
Disable <
Void
>
Disable this entity. -
SetParent <
TargetDestination
>
Changes the entity's parent in the movement hierarchy. -
SetParentAttachment <
String
>
Change this entity to attach to a specific attachment point on its parent. Entities must be parented before being sent this input. The parameter passed in should be the name of the attachment. -
SetParentAttachmentMaintainOffset <
String
>
Change this entity to attach to a specific attachment point on it's parent. Entities must be parented before being sent this input. The parameter passed in should be the name of the attachment. The entity will maintain it's position relative to the parent at the time it is attached. -
ClearParent <
Void
>
Removes this entity from the the movement hierarchy, leaving it free to move independently. -
FollowEntity <
String
>
Bone merges this entity to a parent entity. Call again passing nothing to end the bone merge. -
RunScriptFile <
String
>
Load and execute a script file -
RunScriptCode <
String
>
Execute a fragment of script code -
CallScriptFunction <
String
>
Call a script function -
CallPrivateScriptFunction <
String
>
Calls a script function from this entity's private script scope. -
CallGlobalScriptFunction <
String
>
Calls a script function in the global script scope. -
Kill <
Void
>
Removes this entity from the world. -
KillHierarchy <
Void
>
Removes this entity and all its children from the world. -
KillConstrained <
Void
>
Removes this entity, all its children, and anything constrained to it, from the world. -
AddOutput <
String
>
Adds an entity I/O connection to this entity. Parameter format: outputname>targetname>inputname>parameter>delay>max times to fire (-1 == infinite). Very dangerous, use with care. -
FireUser1 <
Void
>
Causes this entity's OnUser1 output to be fired. -
FireUser2 <
Void
>
Causes this entity's OnUser2 output to be fired. -
FireUser3 <
Void
>
Causes this entity's OnUser3 output to be fired. -
FireUser4 <
Void
>
Causes this entity's OnUser4 output to be fired.
Outputs
-
OnUser1 <
Void
>
Fired in response to FireUser1 input. -
OnUser2 <
Void
>
Fired in response to FireUser2 input. -
OnUser3 <
Void
>
Fired in response to FireUser3 input. -
OnUser4 <
Void
>
Fired in response to FireUser4 input. -
OnKilled <
Void
>
Fired when the entity is killed and removed from the game. Parameter is the inflictor.

Point Entity
Sets a user bounding volume for volumetric fog - if one of these are in the map then all fog will get clamped to it. More than one then fog gets rendered if it's inside any of them.
Keyvalues
-
Start Disabled (
StartDisabled
) <Boolean
> -
Parent (
parentname
) <TargetDestination
>
The name of this entity's parent in the movement hierarchy. Entities with parents move with their parent. -
Parent Model Bone/Attachment Name (
parentAttachmentName
) <ParentAttachment
>
The name of the bone or attachment to attach to on the entity's parent in the movement hierarchy. Use !bonemerge to use bone-merge style attachment. -
Model Attachment position offset (
local.origin
) <Vector
>
Offset in the local space of the parent model's attachment/bone to use in hierarchy. Not used if you are not using parent attachment. -
Model Attachment angular offset (
local.angles
) <Angle
>
Angular offset in the local space of the parent model's attachment/bone to use in hierarchy. Not used if you are not using parent attachment. -
Model Attachment scale (
local.scales
) <Vector
>
Scale in the local space of the parent model's attachment/bone to use in hierarchy. Not used if you are not using parent attachment. -
Use Model Attachment Offset (
useLocalOffset
) <Boolean
>
Whether to respect the specified local offset when doing the initial hierarchical attachment to its parent. -
Entity Scripts (
vscripts
) <ScriptList
>
Name(s) of script files that are executed after all entities have spawned. -
Name (
targetname
) <TargetSource
>
The name that other entities refer to this entity by. -
Box Mins (
box_mins
) <Vector
> -
Box Maxs (
box_maxs
) <Vector
> -
Fog strength (
FogStrength
) <Float
>
Technically the scattering value. Higher values make denser fog. -
Falloff Exponent (
FalloffExponent
) <Float
>
Controls the fall off curve for the fog at the edges -
Falloff Shape (
Shape
) <Choices
>- Linear (Box) Falloff
- Radial (Sphere) Falloff
Inputs
-
Enable <
Void
>
Enable this entity. -
Disable <
Void
>
Disable this entity. -
SetParent <
TargetDestination
>
Changes the entity's parent in the movement hierarchy. -
SetParentAttachment <
String
>
Change this entity to attach to a specific attachment point on its parent. Entities must be parented before being sent this input. The parameter passed in should be the name of the attachment. -
SetParentAttachmentMaintainOffset <
String
>
Change this entity to attach to a specific attachment point on it's parent. Entities must be parented before being sent this input. The parameter passed in should be the name of the attachment. The entity will maintain it's position relative to the parent at the time it is attached. -
ClearParent <
Void
>
Removes this entity from the the movement hierarchy, leaving it free to move independently. -
RunScriptFile <
String
>
Load and execute a script file -
RunScriptCode <
String
>
Execute a fragment of script code -
CallScriptFunction <
String
>
Call a script function -
CallPrivateScriptFunction <
String
>
Calls a script function from this entity's private script scope. -
CallGlobalScriptFunction <
String
>
Calls a script function in the global script scope. -
Kill <
Void
>
Removes this entity from the world. -
KillHierarchy <
Void
>
Removes this entity and all its children from the world. -
AddOutput <
String
>
Adds an entity I/O connection to this entity. Parameter format: outputname>targetname>inputname>parameter>delay>max times to fire (-1 == infinite). Very dangerous, use with care. -
FireUser1 <
Void
>
Causes this entity's OnUser1 output to be fired. -
FireUser2 <
Void
>
Causes this entity's OnUser2 output to be fired. -
FireUser3 <
Void
>
Causes this entity's OnUser3 output to be fired. -
FireUser4 <
Void
>
Causes this entity's OnUser4 output to be fired. -
Enable <
Boolean
>
Enable -
Disable <
Boolean
>
Disable
Outputs
-
OnUser1 <
Void
>
Fired in response to FireUser1 input. -
OnUser2 <
Void
>
Fired in response to FireUser2 input. -
OnUser3 <
Void
>
Fired in response to FireUser3 input. -
OnUser4 <
Void
>
Fired in response to FireUser4 input. -
OnKilled <
Void
>
Fired when the entity is killed and removed from the game.